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Xi (ξ) Ursae Majoris
Yellow Solar-type Star
| Right Ascension | 11h 18m 11s | Best Seen | 2/15 - 7/15 |
| Declination | 31° 31' 47" | Magnitude | 3.79 |
| Constellation | Ursa Major | ||
| Actual | Compared to Sun | |
| Distance | ~11.4 ly | -- |
| Actual Brightness | -- | -- |
| Surface Temperature | ~6000 °K | ~1.03 |
| Diameter | -- | -- |
| Mass | -- | -- |
| Surface Gravity | -- | -- |
| Surface Composition (by mass) | 74% hydrogen 24% helium 2% everything else |
same |
| Spectral Type | G0 V | G2 V |
| Density (gram/cubic cm) | -- | -- |
What To Look For Through The Telescope
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Recommended eyepiece: 24mm or 40 mm.
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When people look through the telescope they should see a faint star. It may appear to be a pale yellow.
Xi Ursae Majoris Information:
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First binary star system ever discovered in May 2, 1780, by Sir William Herschel.
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Xi Ursa Major is a multiple star system. It’s also the first multiple star system to have its orbit calculated (in 1828).
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References
| Item | Updated | Notes |
| Coordinates | 2003-11-26 | SIMBAD 11 18 11 + 31 31 44 Hipparcos 11 18 11 + 31 31 50 |
| Magnitude | 2003-11-26 | SIMBAD 3.78 Hipparcos 3.79 |
| Distance | 2003-11-26 | SIMBAD parallax n/a Hippparcos parallax n/a |
| Actual Brightness | -- | |
| Surface Temperature | -- | |
| Diameter | -- | |
| Mass | -- | |
| Surface Gravity | -- | |
| Surface Composition | 2003-11-26 | OK for all stars |
| Spectral Type | 2003-11-26 | SIMABD, Hipparcos G0V |
| Density | -- | |
| Other Information | 2003-11-26 | http://www.dibonsmith.com/uma_xi.htm |